PROCESS operates on both Windows and Mac versions of SPSS and SAS. PROCESS for SPSS requires SPSS version 19 or later but works best on versions 22 and above. PROCESS for SAS requires PROC IML.Downloading this software implies you have familiarized yourself with and understand the copyright notice and disclaimer below and will comply. This notice is available in the zip archive.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to use the software in this form. Distribution after modification is prohibited, as is its use or distribution for any commercial purpose without authorization from the copyright holder.

This software should not be posted or stored on any webpage, server, or directory accessible to the public whether free or for a charge unless written permission has been granted by the copyright holder. The copyright holder requests that this software be distributed by directing users to processmacro.org where the latest release of the software and documentation is archived and can be downloaded.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Version 3 of PROCESS is described and documented in the 2nd edition of Introduction to Mediation, Moderation, and Conditional Process Analysis. Click the button below to download version 3.1. When you do so, a .zip archive will download in accordance with your browser settings. The installation and use of PROCESS is documented in Appendix A as well as throughout the book. Appendix A also contains the model number templates for pre-programmed models. Instructions for creating your own models or modifying numbered models can be found in Appendix B. The appendices are not electronically available except in the e-book edition.

PROCESS version 2, introduced in 2013 in the first edition of Introduction to Mediation, Moderation, and Conditional Process Analysis (the cover of the first edition is blue; the second edition is white) is no longer available or supported. If you have used PROCESS prior to December 2017 and found it useful, I recommend upgrading to version 3. And if you are still using the 1st edition of the book, consider upgrading to the second edition. For information about the differences between the 1st and 2nd editions, click here.